200425124 玖、發明說明： (一） 發明所屬之技術領域 本發明係關於一種光學拾訊器（pick-up)對物鏡驅動裝置 〇 (二） 先前技術 對碟片等之訊號記錄媒體以光學方式執行訊號讀取 '或 訊號寫入之光學頭具有殻體，在其內部中組裝有做爲發光 元件之半導體雷射及受光元件之檢光器。在殻體中配置有 鋼板製之框架，與其成一體化之致動器係沿著包含有透鏡 之可動部之兩側面的附近而配置，框架的下部中安裝有殻200425124 (1) Description of the invention: (1) the technical field to which the invention belongs The present invention relates to an optical pickup (pick-up) to the objective lens drive device 〇 (2) the prior art to optically perform signal recording media such as discs The optical head for signal reading or signal writing has a housing, and a semiconductor laser as a light emitting element and a photodetector for the light receiving element are assembled in the inside. A frame made of a steel plate is arranged in the casing, and an actuator integrated with the frame is arranged along the vicinity of both sides of the movable portion including the lens, and a casing is mounted in a lower portion of the frame.
JEA 體。 並且，在可動部之透鏡架（lexis holder)上，分別在其左右 之側面中，在做爲碟片側之上部及做爲其相反側之下部分 別設置有支持部。透鏡架分別以懸吊線支持在該4個地點 的支持部上。各懸吊線之另一端設置有保持該懸吊線的保 持部’保持部係以螺絲而鎖在框架上固定。以懸吊線支持 之透鏡架係與線圈捲軸共同地成型，在線圈捲軸之上面設 有突起狀之抵接部。 並且，致動器框架上配置有將可動部全體覆蓋住的鋼板 製之蓋。然後，配置於可動部之左右兩側面上之致動器框 架的上部係利用折曲的板狀彈簧而將蓋之兩上端部覆蓋。 因而，在動作時，蓋之折曲內面與抵接部互相抵接時，可 動部朝向碟片方向而限制其規定以上的動作。因此，蓋之 內面與抵接部被構成止件機構。 ~ 5 - 200425124 【專利文献1】 日本特開平2000-251298號公報 【本發明所欲解決之課題】 在先前技術的物透鏡驅動裝置係構成爲，如前面所述， 配置在懸吊線之兩側面附近之致動器框架上貼附有將可動 部全體覆蓋用之鋼板製之蓋，蓋之止件部分與設置於線圈 捲軸之上面的抵接部互相抵接。但是，在超薄型光學拾訊 器之中，一方面必須進行碟片及光學拾訊器蓋之間的間隙 之確保、及透鏡可動量之確保，一方面必須謀求小型化， 因此會使磁氣回路上部之光學拾訊器蓋配置的止件構成變 成困難。 即，將覆蓋光學拾訊器全體的蓋做爲止件所構成的先前 技術的物透鏡驅可動範圍限制之中，由於蓋的安裝位置之 偏差對姿勢控制之透鏡的影響，而使透鏡之可動範圍產生 偏差。可動範圍產生偏差之時，必須將需要數以上的透鏡 架做成上下、且造成懸吊線的應力增加。在極端的情況， 施加外力（衝擊）之時，對止件的接觸狀態會變成不平衡， 因而有懸吊線變形之虞。 本發明係欲提供可解決上述問題之對物鏡驅動裝置而發 展成功者。 (三）發明說明 【解決課題之手段】 光學拾訊益可動部上設有抵接部，在光學拾訊器可動部 之兩側面附近配置有與框架一體化之致動器框架，在該致 -6 - 200425124 動器框架的上部各設置有止件，止件與該抵接部互相抵接 時’可動部朝向碟片方向而限制其規定以上的動作。 (四）實施方式 【實施例】 第1圖係顯示本發明對物鏡驅動裝置之一個實施例的立 體圖’弟2 Η係顯τρ;弟1圖所不之封物鏡驅動裝置的要部 之一部分除去之狀態的立體圖，第3圖係從第〗圖所示之 對物鏡驅動裝置的不同方向看去之立體圖。 封物鏡1被保持在透鏡架2上，同時其端部上一體地成 型有捲線軸2a。在捲線軸2a上有焦點線圈3捲繞地裝設於 內周上，並且追蹤線圈4,5在捲線軸2a內與焦點線圈3相 接而捲繞在預定位置上。 並且，在透鏡架2之分別左右側面上，配置有互相平行 的上下各二個懸吊線6。在此所謂上下，係在對物鏡驅動裝 置中靠近碟片側之處稱爲上方、上部、上面、上端，遠離 碟片側之處稱爲下方、下部、下面、下端。共計4條之懸 吊線6係分別成爲透鏡架2之彈性支持體。配置於上部側 的懸吊線6之一端，被支持於和透鏡架2 —體成型的支持 部2b，及設置在亦與透鏡架2 —體成型的支持部2b之延長 線上的副支持部2c上。配置於下部側的懸吊線6之一端’ 被支持於和透鏡架2 —體成型的支持部2d，及設置在亦與 透鏡架2 —體成型的支持部2 d之延長線上的副支持部2 e 上。在此，副支持部2e與支持部2d的間隔係設定成比副 支持部2c與支持部2b的間隔更短。 一7 一 200425124 然後，4條之懸吊線6之另一端，分別被焊接在保持構件 7及貼附在保持構件7的印刷基板8上。印刷基板8及保持 構件7係以螺絲1 0而固定於鋼板製框架9上。因而，對物 鏡驅動部係可變位且彈性地支持於框架9上。並且，夾住 透鏡架2之兩側面上，有朝向側面之外方向突起之抵接部2f 一體成型地設置在個別之支持部2b及2d之間。 設置有夾住焦點線圈3及追蹤線圈4,5、且和同一磁極面 (N即）成對向之一對磁鐵1 1及1 2。一對磁鐵11，1 2分別安 裝在與框架9 一體成型的對向之軛13及14上。並且，與 框架9 一體化的致動器框架1 5係配置在沿著懸吊線6之兩 側面之外側附近。 然後，在致動器框架1 5上，貼附設置有橫越其上端及下 端的鋼板製止件1 7。止件1 7係利用在其上端部上設置有爪 17a，17b、下端部設置有爪17c，17d，而貼附在致動器框架 1 5上。在止件1 7之上部，設置有與抵接部2f互相抵接之 抵接面1 7 e的鳄。 從磁鐵1 1及1 2產生的磁通量作用在焦點線圈3及各追 蹤線圈4,5之有效領域上。在此，將焦點錯誤訊號供給到 焦點線圈3時，可實施與透鏡架2 —起將對物鏡1驅動、 而將光束聚焦於碟片之訊號面上的控制。並且，將追蹤錯 誤訊號供給到追蹤線圈4,5之時，可實施使光追隨於碟片 之訊號軌跡上之追蹤控制，因而可與透鏡架2 —起將對物 鏡1驅動，以追蹤記錄於碟片上之訊號。 在如此構成的對物鏡驅動裝置之中，貼附設置在與框架9 一 8 - 200425124 一體化的左右之致動器框架1 5上的止件1 7之抵接面1 7 e 的位置精度，及一體地設置在可動部上之抵接部2 f的位置 精度係很高者。 【發明的效果】 在本發明的對物鏡驅動裝置之中，在光學拾訊器可動部 上設置有抵接部，在光學拾訊器可動部之左右兩外側的附 近配置有和框架成一體化之致動器框架，在該致動器框架 之左右上部各設置有止件，該止件抵接於該抵接部之時， 可限制朝向可動部之碟片方向的規定以上之動作。在將先 前技術之光學拾訊器上部全體以蓋加以覆蓋的構成中，雖 然可確保光學拾訊器全體與碟片之間僅有很少的間隙，但 是利用本發明時，可確保使間隙具有餘裕。 先前技術係將安裝於框架上的鋼板蓋之兩端折曲，而將 追蹤線圈及焦點線圈覆蓋，將該折曲部做爲板彈簧，而利 用做爲止件。從而，在安裝情況不佳而產生蓋之浮起時， 對止件之接觸狀態會變成不平衡。相對於此，本發明係將 止件確實地貼附在左右之指定位置上，因此對左右之止件 的基準點不會產生變化而使抵接位置均相同。因而，具有 由於蓋之浮上而使線之應力增加之危險性變少的效果。 並且，在對物鏡機構全體移動之切線方向的透鏡姿勢調 整時，止件係與框架一體地變位，因此與透鏡架的抵接部 可經常地確保平行的位置關係，而獲得防止產生線變形的 效果。 並且’抵接部係一體地成型在透鏡架的左右兩側面之上 一 9 一 200425124 部及下部的支持部之間，因此強度上很優異。 (五）圖式簡單說明 第1圖係顯示本發明對物鏡驅動裝置之〜個實_ _ 體圖。 —勺立 第2圖係顯示第1圖所示之對物鏡驅動裝置的要^ _ 部分除去之狀態的立體圖。 第3圖係從第1圖所示之對物鏡驅動裝置的不同方向看 去之立體圖。 【符號之說明】 1 對 物 鏡 2 透 鏡 架 2a 捲 線 軸 2b，2d 支 持 部 2 c，2 e 副 支 持 部 2f 抵 接 部 3 焦 點 線 圈 4,5 追 蹤 線 圈 6 県系 吊 線 7 保 持 構 件 8 印 刷 基 板 9 框 架 10 螺 絲 11,12 磁 鐵 13，14 軛 一 1 0 - 200425124 15 致動器框架 17 止件 17a，17b 爪 17c,17d 爪 1 7e 抵接面JEA body. In addition, on the lexis holder of the movable portion, support portions are provided on the left and right side surfaces, respectively, as the upper portion on the disc side and the lower portion on the opposite side. The lens holders are supported by suspension lines on the support sections of the four locations. The other end of each suspension line is provided with a holding portion 'which holds the suspension line. The holding portion is fixed to the frame with a screw. The lens holder supported by the suspension wire is molded together with the coil reel, and a protruding abutment portion is provided on the coil reel. The actuator frame is provided with a cover made of a steel plate that covers the entire movable portion. Then, the upper portions of the actuator frames disposed on the left and right side surfaces of the movable portion cover the upper end portions of the cover with a bent leaf spring. Therefore, when the bent inner surface of the cover and the abutting portion are in contact with each other during operation, the movable portion faces the direction of the disc and restricts its operation more than a predetermined value. Therefore, the inner surface of the cover and the abutting portion constitute a stopper mechanism. ~ 5-200425124 [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-251298 [Problems to be Solved by the Invention] The objective lens driving device of the prior art is configured to be disposed on both sides of the suspension wire as described above. The nearby actuator frame is attached with a cover made of a steel plate for covering the entire movable portion, and a stopper portion of the cover and a contact portion provided on the upper surface of the coil reel abut each other. However, in the ultra-thin optical pickup, it is necessary to ensure the gap between the disc and the optical pickup cover and the movable amount of the lens. On the other hand, it is necessary to reduce the size. It becomes difficult to configure the stopper arrangement of the optical pickup cover on the upper part of the air circuit. That is, in the limitation of the movable range of the objective lens drive of the prior art, which is constituted by the cover covering the entire optical pickup, the movable range of the lens is affected by the deviation of the installation position of the cover on the lens for attitude control. Deviation. When there is a deviation in the movable range, it is necessary to make the lens holder more than necessary up and down, and increase the stress on the suspension wire. In an extreme case, when an external force (impact) is applied, the contact state of the stopper becomes unbalanced, so that the suspension wire may be deformed. The present invention is to succeed in providing an objective lens driving device which can solve the above problems. (3) Description of the invention [Means for solving the problem] An abutment part is provided on the movable part of the optical pickup, and an actuator frame integrated with the frame is arranged near both sides of the movable part of the optical pickup. -6-200425124 Each of the upper parts of the actuator frame is provided with stoppers. When the stoppers and the abutting parts abut each other, the 'movable part faces the direction of the disc and restricts more than its prescribed movement. (IV) Embodiment [Example] Fig. 1 is a perspective view showing an embodiment of the objective lens driving device according to the present invention, 'Di 2 Η is τρ; part of the main objective driving device not shown in Fig 1 is removed FIG. 3 is a perspective view of the state of the objective lens driving device shown in FIG. 3 as viewed from different directions. The objective lens 1 is held on the lens holder 2 while a spool 2a is integrally formed on an end portion thereof. A focus coil 3 is wound on the inner periphery of the reel 2a, and the tracking coils 4, 5 are in contact with the focus coil 3 in the reel 2a and wound at a predetermined position. In addition, on the left and right side surfaces of the lens frame 2, two upper and lower suspension wires 6 are arranged in parallel with each other. Here, the so-called up and down refers to the upper, upper, upper, and upper ends of the objective lens driving device near the disc side, and the lower, lower, lower, and lower ends away from the disc side. A total of 4 suspension wires 6 are used as the elastic support bodies of the lens holder 2 respectively. One end of the suspension wire 6 disposed on the upper side is supported by a support portion 2b formed integrally with the lens frame 2 and a sub-support portion 2c provided on an extension line of the support portion 2b integrally formed with the lens frame 2 . One end of the suspension wire 6 disposed on the lower side is supported by a support portion 2d formed integrally with the lens frame 2 and a sub-support portion 2 provided on an extension line that is also formed with the lens frame 2 supported integrally 2d. e on. Here, the interval between the sub-support portion 2e and the support portion 2d is set to be shorter than the interval between the sub-support portion 2c and the support portion 2b. One 7 one 200425124 Then, the other ends of the four suspension wires 6 are soldered to the holding member 7 and the printed circuit board 8 attached to the holding member 7, respectively. The printed board 8 and the holding member 7 are fixed to a steel plate frame 9 with screws 10. Therefore, the objective lens driving unit is elastically supported on the frame 9 while being displaceable. In addition, abutment portions 2f protruding outward from the sides of the lens holder 2 are integrally formed between the respective support portions 2b and 2d. A pair of magnets 1 1 and 12 are provided to sandwich the focus coil 3 and the tracking coils 4 and 5 and face the same magnetic pole surface (N). A pair of magnets 11, 12 are mounted on opposing yokes 13 and 14 integrally formed with the frame 9, respectively. The actuator frame 15 integrated with the frame 9 is arranged near the outer side of both side surfaces along the suspension line 6. Then, the actuator frame 15 is attached with a steel plate stopper 17 provided across the upper and lower ends thereof. The stopper 17 is attached to the actuator frame 15 by using claws 17a and 17b on its upper end and claws 17c and 17d on its lower end. On the upper part of the stopper 17, a crocodile with a contact surface 17e which abuts against the contact portion 2f is provided. The magnetic fluxes generated from the magnets 11 and 12 act on the effective areas of the focus coil 3 and each of the tracking coils 4,5. Here, when a focus error signal is supplied to the focus coil 3, control can be performed with the lens holder 2 to drive the objective lens 1 and focus the light beam on the signal surface of the disc. In addition, when a tracking error signal is supplied to the tracking coils 4 and 5, tracking control can be implemented to make light follow the signal track of the disc, so the lens 1 can be driven together with the lens holder 2 to track and record the The signal on the disc. In the thus-configured objective lens driving device, the positional accuracy of the abutment surface 17 of the stopper 17 on the left and right actuator frame 15 integrated with the frame 9-8-200425124 is attached, And the position accuracy of the contact portion 2 f integrally provided on the movable portion is high. [Effects of the Invention] In the objective lens driving device of the present invention, abutment portions are provided on the movable portion of the optical pickup, and integrated with the frame are arranged near the left and right outer sides of the movable portion of the optical pickup. In the actuator frame, stoppers are respectively provided on the left and right upper portions of the actuator frame, and when the stoppers abut against the abutting portion, it is possible to restrict the movement in a direction toward the disc of the movable portion by more than a predetermined amount. In the structure in which the entire upper part of the optical pickup of the prior art is covered with a cover, although there is only a small gap between the entire optical pickup and the disc, it is possible to ensure that the gap is provided with the present invention. Yu Yu. In the prior art, two ends of a steel plate cover mounted on a frame are bent, the tracking coil and the focus coil are covered, and the bent portion is used as a leaf spring, and is used as a stop piece. Therefore, when the cover is raised due to poor installation conditions, the contact state with the stopper becomes unbalanced. In contrast, in the present invention, the stoppers are reliably attached to the left and right designated positions, so the reference points of the left and right stoppers do not change and the contact positions are the same. Therefore, there is an effect that there is less danger that the stress of the wire increases due to the floating of the cover. In addition, when adjusting the posture of the lens in the tangential direction of the entire movement of the objective lens mechanism, the stopper is integrally displaced with the frame. Therefore, the abutting portion with the lens frame can always ensure a parallel positional relationship to prevent line distortion Effect. In addition, the abutting portions are integrally formed on the left and right side surfaces of the lens holder, and the supporting portions are excellent in strength. (V) Brief Description of Drawings Fig. 1 is a drawing showing the real lens driving device of the present invention. —Scoop stand. Fig. 2 is a perspective view showing a state where the ^ _ part of the objective lens driving device shown in Fig. 1 is removed. Fig. 3 is a perspective view of the objective lens driving device shown in Fig. 1 viewed from different directions. [Explanation of symbols] 1 pair of objective lens 2 lens holder 2a spool 2b, 2d support 2c, 2e sub-support 2f abutment 3 focus coil 4, 5 tracking coil 6 sling line 7 holding member 8 printed circuit board 9 Frame 10 Screw 11, 12 Magnet 13, 14 Yoke 1 0-200425124 15 Actuator frame 17 Stopper 17a, 17b Jaw 17c, 17d Jaw 1 7e Abutment surface
一 1 1 -A 1 1-